Sash-balance.



No. 809,783. PATENTED JAN. 9, 1906. H. A. GROMMET'I.

SASH BALANCE.

APPLICATION FILED MAR.31.1905.

HTS-SHEET 1.

WITNESSES: IVVENTOH W m fi erfiez" Qvmmefi ATTORNEYS No. 809,783. PATENTED JAN. 9, 1906 H. A. GROMMETT.

SASH BALANCE. nrmouxon mum MAR. 31, 1905.

UNITE SITES ATENT @FFIQE.

SASH-BALANOE;

Specification of Letters Patent.

Patented Jan. 9, 1906.

Application filed March 31,1905. Serial No. 253,035.

To all whom it may concern:

Be it known that I, HERBERT ALGERNON CROMMETT, a citizen of the United States, and a resident of Patten, in the county of Penobscot and State of Maine, have invented a new and Improved Sash-B alance, of which the following is a full, clear, and exact description.

This invention relates to the balancing of window-sashes; and its object is to provide simple means for accomplishing this without necessitating the employment of the usual counterweights.

The invention is most applicable to windows having an upper sash and a lower sash, one of which may be lowered and the other raised in order to open the window. In one application of the invention the sashes may be arranged so as to balance each other, the slack of cord being taken up by my device. In a second application of the invention independent devices may be used in connection with each sash.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a front elevation of a window, showing two sashes to which my invention has been applied, the casement and parts of the sashes being shown in section. This view represents the arrangement suggested in which independent devices are used with each sash. The section of the casement as represented in Fig. 1 is taken substantially upon the line 1 1 of Fig. 2.. Fig. 2 is a side elevation of a portion of the window-casement, showing the manner in which the devices are applied. Fig. 3 is a side elevation, upon an enlarged scale, showing one of the devices. Fig. 4 is a section taken substantially upon the line 4 4 of Fig. 3; and Fig. 5 is a View similar to Fig. 2, but representing an arrangement enabling the sashes to counterbalance each other.

Referring more particularly to the parts, 1 represents the lower sash, and 2 the upper sash, both of which are mounted to slide vertically in a suitable casement 3.

In applying my invention I provide within the spaces 4 within the easement my devices 5, the same being attached to the side of the casement in a manner which will be described more fully hereinafter. As illustrated in Fig. 1, I provide two of these devices in con nection with the lower sash and two in connection with the upper sash.

Referring now to Figs. 3 and 4, the device consists of a vertically-disposed guide-bar 6, which is offset inwardly, as shown in Fig. 4, to form a foot 7 at its lower extremity, which attaches to the casement, as shown. The upper end of this guide-bar 6 is bent so as to form a bow member or crook 8 of substantially circular form, the extremity of the bow terminating in a substantially straight extension or arm 9, which is disposed transversely and at an inclination to the body of the guidebar, as indicated. Adjacent to the bow mem ber 8 there is a similar bow member 10, the body of which is substantially circular, as shown, and formed integral with a shank 11 and an arm 12. The said shank is disposed substantially parallel with the upper extremity of the bar 6 near the bow member 8 and is rigidly attached thereto by a fixed sleeve or clamp 13. The manner in which the bow member 10 is arranged is the reverse of that of the bow member 8, so that the arm or extension 12 projects at substantially the same inclination as the arm 9, but in the opposite direction and on the opposite side of the guide-bar 6. Upon the body of the guidebar 6 I provide a sliding sleeve or collar 14, to the outer side whereof the lower extremity of the lazy-tongs 15 is attached, and to the lower extremity of the lazy-tongs there is attached a pulley or sheave 16, being attached upon the body of a hook 17, which preferably opens downwardly, as shown. The uppermost leaves or levers 18 of the lazy-tongs are adjustably attached in some such manner as that indicated to the arms 19 and 12. It should be understood that the bow members 8 and 10 are resilient and that they together constitute a bow having arms 9 and 12,which the resiliency of the bow tends to force inwardly. From this arrangement the tendency of the device is to extend the lazy-tongs. The upper extremity of the device is attached to the easement at the upper portion of the bow by means of a fastening 19, bent around the bow members, as shown, the outer extremity of the fastening being formed into a hook 20 for a purpose which will appear more fully hereinafter. Inorder to enable the force exerted by the bow to be adjusted, the uppermost leaves 18 of the lazy-tongs are preferably provided with a plurality of openings 21, thr0ugh which the bent extremities of the arms 19 and 12 may be thrust and attached, as indicated.

Referring now especially to Fig. 2, in hanging the upper sash 2 the sash-cord 22 thereof will pass into the casement-space 1, running over a pulley 23, as shown. This cord will pass downwardly and around the pulley or sheave 16. From this point the cord will pass upwardly, and its end Wlll be attached to the hook 20, just referred to. The sash-cord 22 is attached near the upper extremity of the sash 2, as usual. In hanging the sash 1 the sash-cord 24 is attached to the sash, near the lower extremity thereof, as at 25, and passes upwardly from this point of attachment along the rail of the sash to a point near its upper extremity, where it passes over a pulley 26, set in the casement. From this point the cord passes downwardly and is arranged in the same way as the cord 22 with respect to the device 5. It should be stated, however, and it will be observed from Fig. 2 that the device 5 used in connection with the upper sash is normally extended when the upper sash is closed, while the device 5 used in connection with the lower sash is normally in a contracted position. This diflference in arrangement follows from the fact that when the upper sash is lowered a quantity of sash cord passes out of the casement, and when the lower sash is raised a quantity of cord passes into the casement. The resence of the bows afiords means for ofierlng a substantial resistance to the movement of the sashes. In connection with the upper sash evidently if the sash be lowered the movement of the cord out of the easement will operate to contract more or less the lazytongs. In the raising of the lower sash evidently the increase in the quantity of cord within the easement will allow the lazytongs to expand more or less. From an inspection of Fig. 3, where themanner in which the bows apply their force is' most clearly illustrated, it will be evident that the direction of application of the extending force does not alter very greatly with the difierent conditions of expansion or contraction of the lazy-tongs, and from this fact it follows that the resistance ofiered to the movement is substantially constant.

In Fig. 5 an arrangement is illustrated whereby the sashes may be made to counterbalance each other. In this instance the device 5 is attached to the side of the casement near the lower portion thereof. The sashpulleys 27 are then both attached near the upper portion of the easement, and a single sash-cord 28 is employed, the ends of which attach to the sashes 1 and 2, as shown. The body of the cord then hangs down in a loop or bight 29, which supports a block or sheave 30. The lower extremity of this block 30 is attached to a cord 31, which passes down around the pulley 16 and up to the hook 20, where its end is attached. It being understood that the tendency of the lazy-tongs is to extend itself, it then follows that the device arranged as now described will operate to take up the slack which may tend to occur in the sash-cord 28. With this arrangement evidently either of the sashes may be raised or lowered without affecting the condition of the other sash.

In the arrangement shown in Fig. 1 it will be seen that the sashcord which supports the lower sash is never visible, and for this reason some builders may prefer to use this arrangement.

The arrangement which consists in passing the cords throughthe pulleys 16 of the devices before attaching the same is not essential, of course, as the cords could be attached directly to the hooks 17, that being the purpose of the hooks 17. Attaching the cords in this manner would of course result in bringing about a greater movement of the lazy-tongs for a corresponding movement of the sashes.

The invention evidently affords means operated in a simple manner for the purpose stated.

Instead of using the openin s 21 to enable the adjustments to be made I may employ slots, so that the arms of the bow may be slid to any point desired and locked in position by nuts.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a sash-balance, in combination, a guide-bar, a lazy-tongs guided thereupon, a resilient bow having extensions attached to said lazy-tongs, and means for attaching a sash-cord to said sash-balance.

2. In a device of the class described, in combination, a guide-bar, a sleeve slidably mounted thereon, a lazy-tongs having its extremity attached to said sleeve, a resilient bow attached to the arms of said lazy-tongs, and tending to extend said lazy tongs and means for attaching a cord to said device.

3. In a device of the class described, in combination, a lazytongs, a resilient bow at one extremity thereof and having extensions attached to the arms of said tongs and constraining same, said bow lying substantially in the plane of said tongs, means for fixing one end of said device to a support, and means for attaching the other end of said device to a sash.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HERBERT ALGERNON CROMMETT.

W1tnesses:

FRANK J. CROMMETT, CONSIDER CAMPBELL.

IIO 

